Materials Transactions Online

Materials Transactions, Vol.55 No.05 (2014) pp.774-778
© 2014 The Japan Institute of Metals and Materials

In Situ and Real-Time Observation of the Solidification Process of Al-20 mass%Cu Alloy by Synchrotron X-ray Radiography

Maodong Kang1, Haiyan Gao1, Da Shu1, Jun Wang1, 2, Faguo Li1, Yanan Fu3, Lishibao Ling1 and Baode Sun1, 2

1Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200-240, P. R. China
2The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200-240, P. R. China
3Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Shanghai 215-600, P. R. China

High brilliance synchrotron X-ray radiography has been used to in situ study the solidification process of Al-20 mass%Cu alloy with nominal spatial and temporal resolutions of 7.4 µm and 300 ms, respectively. The block of favorably oriented dendrites by the unfavorably oriented ones was first observed in metal solidification, which related to solute interaction of neighbor dendrites. Solute interaction can also retard the growth of dendrites at the grain boundary, which makes the unusual overgrowth phenomenon possible. Fragmentation occurred when dendrite branches were detached from mother dendrite by local re-melting during the dendrite ripening. Fragmentations together with nucleated dendrites contributed to the columnar to equiaxed transition (CET) and the gravity played a significant role in the final microstructure due to the density difference between primary aluminum dendrites and the melt. In addition, the microporosity formation was observed in the inter-dendrite at the last stage of solidification.

(Received 2014/01/28; Accepted 2014/02/24; Published 2014/04/25)

Keywords: synchrotron radiation, competitive dendrite growth, fragmentation, microporosity

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